Etherchannel Layer 2 LACP Configuration
In this How To we will cover how to configure LACP for a Layer 2 Etherchannel on Cisco Catalyst switches.
We will need to first bundle our interfaces into a port-channel
Configuration
First, we must go into global configuration mode and place our interfaces into a "Channel-group"
SW1#configure terminal # This command puts us in Global Config mode
SW1(config)#interface range eth0/0 - 1 # This command will put you into the interface sub-configuration mode for multiple interfaces
SW1(config-if-range)#channel-group 44 mode active # This command will bundle the member interfaces into a port-channel using LACP negotiation to negotiate with the other side actively.
SW1(config)#interface port-channel 44 # This command will put us into the port-channel sub-configuration mode
All configurations should now be configured under the port-channel. The port-channel will then push the configuration down to the member interfaces.
SW1(config-if)switchport trunk encapsulation dot1q # This command will set the trunk to use the IEEE 802.1q Encapsulation standard
SW1(config-if)#switchport mode trunk # This command will statically set the interface to trunking mode.
The complete configuration for both switches is shown below
Verification
The following show commands will verify if the etherchannel is working properly.
SW1#show etherchannel summary # This command will show us if our Etherchannel is bundled and active.
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